WoS İndeksli Yayınlar Koleksiyonu

Permanent URI for this collectionhttps://gcris.yasar.edu.tr/handle/123456789/11289

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Citation - WoS: 11
Citation - Scopus: 13
A 3-Dimensional Architectural Layout Generation Procedure for Optimization Applications: DC-RVD
(Education and research in Computer Aided Architectural Design in Europe, 2014) Ioannis Chatzikonstantinou; Chatzikonstantinou, Ioannis; E.M. Thompson
A procedure for generating 3-dimensional spatial configurations for optimization applications termed Dimension Constrained Rectangular Voronoi Diagram (DC-RVD) is presented in this paper. The procedure is able to generate a non-overlapping configuration of spatial units in 3-dimensional space given a string of real values. It constitutes an extension and adaptation of the Rectangular Voronoi Diagram generating procedure found in the work of Choi and Young (1991). An extensive description of the procedure with the relevant pseudocode is included in the paper. The procedure is tested in a stochastic optimisation-based decision support environment. Testing is done using a case study of a medium-sized family house. The result indicate promising performance. © 2024 Elsevier B.V. All rights reserved.
Citation - WoS: 2
Citation - Scopus: 2
A bi-criteria single machine scheduling with rate-modifying-activity
(Gazi Universitesi, 2013) Yucel Yilmaz Ozturkoglu; Öztürkoǧlu, Yücel
In this paper we consider a single machine scheduling problem with two criteria: minimizing both total flow time with total tardiness and minimize maximum tardiness with number of tardy jobs. Unlike the classical scheduling problems we use a job position deterioration which means that the job processing time increases as a function of the job position. Besides deteriorated jobs we also consider rate-modifying-activities which alter the efficiency of the deteriorating processor. This is the first paper to combine both time dependent processing times and problems with rate-modifying-activity in the bi-criteria objectives. To solve the new type of problem we introduce a new scheduling mathematical model which is based on one developed Ozturkoglu and Bulfin [1]. To analyze the efficiency of the mathematical model we use three different approaches. According to computational results up to 50 jobs can be solved in less than one minute. © 2023 Elsevier B.V. All rights reserved.
Citation - Scopus: 2
A critical evaluation of Heidegger’s criticism of aesthetics in ‘The Origin of the Work of Art’
(SAGE Publications Ltd info@sagepub.co.uk, 2016-11-01) Ahmet Süner; Süner, Ahmet
This paper examines and critiques Heidegger’s repudiation of aesthetics in his essay ‘The Origin of the Work of Art’ and claims that his alternative approach to artworks in the essay must be understood as a theory of aesthetics and more particularly of aesthetic use which delineates the inseparability of senses and sensations. The paper analyses Heidegger’s explicit remarks on aesthetics in the epilogue discusses his criticism of the aesthetic thing-interpretation at the beginning of the essay and concludes with some critical observations on Heidegger’s own aesthetics. While critical of Heidegger’s separation of the equipment from the artwork the paper claims that Heidegger’s significant contribution to the field of aesthetics must be sought in his focus on the attenuation of the subjective element in aesthetic experience. © 2017 Elsevier B.V. All rights reserved.
Citation - WoS: 20
Citation - Scopus: 21
A critical review on classification and terminology of scissor structures
(Int. Association for Shell and Spatial Structures, 2019-03-01) Feray Maden; Yenal Akgün; Gökhan Kiper; Şebnem Gür; Müjde Yar; Koray Korkmaz; Korkmaz, Koray; Yar, MÜJde; Kiper, GÖKhan; Akgun, Yenal; Maden, Feray; Gur, Sebnem
When the existing literature on the research of scissor structures is thoroughly investigated it is seen that different researchers use different terminologies and classifications especially for the definition of the primary units and the motion type. Some of the studies define the whole geometry based on the geometric properties of the primary scissor units and the unit lines while some other studies define it according to the loops. All these studies use different names for similar elements. This article aims to review the literature on the classification and terminology of scissor structures and represent the state of art on the studies. Tables are represented showing all approaches in the literature. In addition the article criticizes the missing points of each terminology and definition and proposes some new terminology. In order to arrive at this aim different definitions of the primary scissor units and motion types used in key studies in the literature are investigated thoroughly. With several examples it is demonstrated that naming the scissor units according to the resulting motion type might be misleading and it is better to specify the motion type for the whole structure. A classification for transformation of planar curves is presented. © 2019 Elsevier B.V. All rights reserved.
Citation - WoS: 8
Citation - Scopus: 9
A differential evolution algorithm with a variable neighborhood search for constrained function optimization
(Springer Verlag service@springer.de, 2015) M. Fatih Tasgetiren; Ponnuthurai Nagaratnam Suganthan; Sel Ozcan; Damla Kizilay; Tasgetiren, M. Fatih; Suganthan, P.N.; Kizilay, Damla; Ozcan, Sel
In this paper a differential evolution algorithm based on a variable neighborhood search algorithm (DE_VNS) is proposed in order to solve the constrained real-parameter optimization problems. The performance of DE algorithm depends on the mutation strategies crossover operators and control parameters. As a result a DE_VNS algorithm that can employ multiple mutation operators in its VNS loops is proposed in order to further enhance the solution quality. We also present an idea of injecting some good dimensional values to the trial individual through the injection procedure. In addition we also present a diversification procedure that is based on the inversion of the target individuals and injection of some good dimensional values from promising areas in the population by tournament selection. The computational results show that the simple DE_VNS algorithm was very competitive to some of the best performing algorithms from the literature. © 2015 Elsevier B.V. All rights reserved.
A discrete event simulation procedure for validating programs of requirements: The case of hospital space planning
(Elsevier B.V., 2020-07) Cemre Cubukcuoglu; Pirouz Nourian; I. Sevil Sariyildiz; M. Fatih Tasgetiren
This paper introduces a Discrete-Event Simulation (DES) tool developed as a parametric CAD program for validating a program of requirements (PoR) for hospital space planning. The DES model simulates the procedures of processing of patients treated by doctors calculating patient throughput and patient waiting times based on the number of doctors patient arrivals and treatment times. In addition the tool is capable of defining space requirements by taking hospital design standards into account. Using this tool what-if scenarios and assumptions on the PoR about space planning can be tested and/or validated. The tool is ultimately meant for reducing patient waiting times and/or increasing patient throughput by checking the match of the layout of a hospital with respect to its procedural operations. This tool is envisaged to grow into a toolkit providing a methodological framework for bringing Operations Research into Architectural Space Planning. The tool is implemented in Python for Grasshopper (GH) a plugin of Rhinoceros CAD software using the SimPy library. © 2020 Elsevier B.V. All rights reserved.
Citation - WoS: 9
Citation - Scopus: 11
A Joint Evaluation of Streamflow Drought and Standard Precipitation Indices in Aegean Region- Turkey
(SPRINGER BASEL AG, 2023-11-23) Ayse Gulmez; Denizhan Mersin; Babak Vaheddoost; Mir Jafar Sadegh Safari; Gokmen Tayfur; Tayfur, Gokmen; Vaheddoost, Babak; Safari, Mir Jafar Sadegh; Mersin, Denizhan; Gulmez, Ayse
Water is an invaluable substance that ensures the life cycle and causes hydrologic events worldwide. Water deficit also known as drought is a naturally occurring disaster that affects the hydrometeorologic and/or climatic responses in time and space. In this study the meteorologic and hydrologic droughts in Buyuk Menderes Kucuk Menderes and Gediz basins in Turkey are investigated. The streamflow drought index (SDI) and standard precipitation index (SPI) are used considering different time windows. To achieve this the monthly streamflow at Cicekli-Nif Besdegirmenler-Dandalas Bebekler-Rahmanlar and Kocarli-Koprubasi hydrometric stations together with monthly precipitation at 14 meteorologic stations during 1973-2020 (47 years) are used. The SDI and SPI with 1 3 6 and 12 months moving average are then used to express the association between the meteorologic and hydrologic droughts in the basin. Results showed that the SDI depicts no abnormal situations while the SPI rates in the 1980s and 2010s indicated severe droughts. It was concluded that the inner parts of the basins are prone to frequent droughts and there is a concordance between SPI and SDI patterns at the basin level. However minor discrepancies between SPI and SDI do exist and probably originated from temporal delays and water abstraction.
A new model for minimizing the electric vehicle battery capacity in electric\rtravelling salesman problem with time windows
(Tubitak Scientific & Technological Research Council Turkey, 2021-09-23) Kazım Erdoğdu; KORHAN KARABULUT; Erdoğdu, Kazım; Karabulut, Korhan
The growing pollution in the environment and the negative shift in the global climate compel authorities\rto take action to protect the environment and human health. Transportation is one of the major contributors to this\renvironmental decay. The harmful gases released to the air by the vehicles using petroleum fuel increase each day. One\rof the solutions is to make a gradual transition to electric vehicles. A major part of manufacturing an electric vehicle\ris to produce an efficient electric motor and battery for it. Reducing the manufacturing and operating costs of these\rcomponents will result in reducing the overall costs of electric vehicles. In this study a new variant of the electric\rtravelling salesman problem with time windows (E-TSPTW) was proposed. The objective function of the problem is to\rminimize the required initial battery capacity of the electric vehicle. For this goal a new energy consumption model\rconsidering the load of the vehicle was proposed with three scenarios. The proposed model was solved with a hybrid\rsimulated annealing algorithm for all these scenarios. The performance of the proposed method was compared to the\rsolutions found by a mixed integer linear programming model. The experimental results on the benchmark instances\rshow that up to a 35% reduction in initial battery capacity hence reduction in its cost is possible.\r
Citation - WoS: 5
Citation - Scopus: 10
A new warehouse design problem and a proposed polynomial-time optimal order picking algorithm
(GAZI UNIV FAC ENGINEERING ARCHITECTURE, 2018-04-06) Omer Ozturkoglu; Deniz Hoser; Hoşer, Deniz; Öztürkoğlu, Ömer
In this study we propose a new design problem that relates to orientation of cross aisles in warehouses. In this problem the main orthogonal cross aisle which is very common to be seen in warehouses to facilitate travel between locations is planned to be designed as discrete manner such as tunnels along picking aisles. Hence the problem of locating these tunnels along picking aisles so as to increase efficiency of order picking operations which is one of the most costly and the most related operations with the order delivery time in warehouses is propounded. Additionally we develop a new dynamic programming based polynomial time algorithm to calculate optimal length of order picking tour in this new design problem. Hence this algorithm provides very quick solutions even for large pick list sizes. The computational performance of this algorithm is compared with Held-Karp branch and bound algorithm which is a well-known algorithm for travelling salesman problem. Last we solve an example problem and explain how the algorithm is implemented to generate optimal tour.
Citation - WoS: 18
Citation - Scopus: 18
A Parametric Study of a Piston-Prop Aircraft Engine Using Exergy and Exergoeconomic Analysis Methods
(TAYLOR & FRANCIS INC, 2014-09-16) Onder Altuntas; T. Hikmet Karakoc; Arif Hepbasli; Altuntas, Onder; Hepbasli, Arif; Karakoc, T. Hikmet
In this study exergetic and exergoeconomic analysis methods are applied to a four-cylinder spark ignition (SI) naturally aspirated and air-cooled piston-prop aircraft engine in the cruise phase of flight operations. The duration of cruise is selected to be 1 h. Three parameters altitude rated power setting (PS) and air-to-fuel ratio (AF) are varied by the calculation of the max-min values of exergy analysis. Based on the results of energy analysis the values for the maximum energy efficiency and fuel consumption flow rate are calculated to be 21.73% and 28.02 kg/h respectively at 1000-m altitude and 75% PS. The results of exergy analysis indicate that all exergetic values vary from 65% to 75% PS while this increase is not seen in exergoeconomic analysis. While the maximum exergy input rate is obtained to be 405.60 kW exergy efficiency has the minimum value with 14.43% and exergy destruction rate has the maximum value with 168.48 kW. These values are achieved at 3000-m altitude and 18 AFs. The maximum average exergy cost of the fuel is calculated to be 130.77 $/GJ at 1000-m altitude 13 AF ratios and 65% PS. At this point while the minimum cost rate associated with the exergy destruction is obtained to be 40.29 $/h the maximum exergoeconomic factor is found to be 19.98%.
Citation - WoS: 1
Citation - Scopus: 1
A Pattern Mining Approach for Improving Speech Emotion Recognition
(WORLD SCIENTIFIC PUBL CO PTE LTD, 2022-11) Umut Avci; Avci, Umut
Speech-driven user interfaces are becoming more common in our lives. To interact with such systems naturally and effectively machines need to recognize the emotional states of users and respond to them accordingly. At the heart of the emotion recognition research done to this end lies the emotion representation that enables machines to learn and predict emotions. Speech emotion recognition studies use a wide range of low-to-high-level acoustic features for representation purposes such as LLDs their functionals and BoAW. In this paper we present a new method for extracting a novel set of high-level features for classifying emotions. For this purpose we (1) reduce the dimension of discrete-time speech signals (2) perform a quantization operation on the new signals and assign a distinct symbol to each quantization level (3) use the symbol sequences representing the signals to extract discriminative patterns that are capable of distinguishing different emotions from each other and (4) generate a separate set of features for each emotion from the extracted patterns. Experimental results show that pattern features outperform Energy Voicing MFCC Spectral and RASTA feature sets. We also demonstrate that combining the pattern-based features and the acoustic features further improves the classification performance.
Citation - WoS: 5
Citation - Scopus: 4
A Reduced Order Modeling Methodology for Steam Turbine Clearance Control Design
(American Society of Mechanical Engineers (ASME) infocentral@asme.org, 2017-04-11) Emrah Biyik; Fernando Javier D'Amato; Arun K. Subramaniyan; Changjie Sun; Subramaniyan, Arun; Sun, Changjie; Biyik, Emrah; D'Amato, Fernando J.
Finite element models (FEMs) are extensively used in the design optimization of utility scale steam turbines. As an example by simulating multiple startup scenarios of steam power plants engineers can obtain turbine designs that minimize material utilization and at the same time avoid the damaging effects of large thermal stresses or rubs between rotating and stationary parts. Unfortunately FEMs are computationally expensive and only a limited amount of simulations can be afforded to get the final design. For this reason numerous model reduction techniques have been developed to reduce the size of the original model without a significant loss of accuracy. When the models are nonlinear as is the case for steam turbine FEMs model reduction techniques are relatively scarce and their effectiveness becomes application dependent. Although there is an abundant literature on model reduction for nonlinear systems many of these techniques become impractical when applied to a realistic industrial problem. This paper focuses on a class of nonlinear FEM characteristic of thermo-elastic problems with large temperature excursions. A brief overview of popular model reduction techniques is presented along with a detailed description of the computational challenges faced when applying them to a realistic problem. The main contribution of this work is a set of modifications to existing methods to increase their computational efficiency. The methodology is demonstrated on a steam turbine model achieving a model size reduction by four orders of magnitude with only 4% loss of accuracy with respect to the full order FEMs. © 2017 Elsevier B.V. All rights reserved.
A review of substrate integrated waveguide (SIW) filter architecture and filter design technologies, Yüzey tümleşik dalga kılavuzu (YTD) filtre mimarisi incelemesi ve filtre tasarım teknolojileri
(Gazi Universitesi, 2023-11-30) Kemal Güvenli; Sibel Yeni̇Kaya; Mustafa Seçmen
In this review article transmission line technologies are compared in terms of loss dimension production cost ease of integration and design complexity. The basic design stages of the Substrate Integrated Waveguide (SIW) filter which stands out with its advantages among transmission lines are given. Current studies using different SIW filter technologies have been examined in the literature. The quality factors of the examined SIW filters were calculated and a comparison was made between the applied techniques. In addition the methods applied in the literature to eliminate the harmonic and high mode effects that adversely affect the SIW filter performance are examined and the results are evaluated. © 2023 Elsevier B.V. All rights reserved.
A Spatial Reflection of Social Transformation: Taksim Municipal Gazino 1939
(ISTANBUL UNIV RESEARCH INST TURKOLOGY DEPT ART HISTORY, 2024-01-31) Begum Sena Onal Ozmalatyalilar; Meltem O. Gurel; Gurel, Meltem O.; Önal, Begüm Sena; Ozmalatyalilar, Begum Sena Onal; Gürel, Havva Meltem; Önal Özmalatyalilar, Begüm Sena
Taksim Municipal Gazino which hosted its visitors inside the Inonu Promenade between 1939 and 1967 was one of the leading examples of gazinos (an entertainment venue) built with the support of the state in the early republican era in Turkey. Designed by the municipality architect Ruknettin Guney within the scope of French city planner Henri Prost's Istanbul Master Plan the edifice was a quintessential example of modern architecture that epitomized the state's Westernization ideology. This article examines the gazino practice as a spatial reflection of social transformation by presenting a historical and spatial reading of the Taksim Municipal Gazino. The study analyzes the gazino structure as a power mechanism that produces secular identities by focusing on the dialectic between the spaces in the building and the experiences of its patrons. The analysis of architectural drawings photographs and literary works associated with the building on the one hand reveals how the architect operating as a cultural leader utilized architectural creation to present the Western lifestyle to society. On the other hand it indicates that Taksim Municipal Gazino served as a platform for individuals to display their modernity. Moreover the study propounds that the building contributed to the modernization process of the newly established nation-state and it has served as a spatial tool that notably strengthened the position of female regulars in the public sphere.
A Symmetrical-Asymmetrical Fault Characteristics Analysis within Cogeneration Power Plant in Izmir Turkey: An Experimental Assessment
(Gazi Universitesi, 2022-06-01) Hacer Sekerci Öztura; Sezai Polat
The analysis of the short circuit should be understood very well in order to make correct designs in the power systems such as the safety of the personnel and the equipment the selection of the safety relays the circuit breaker selection and the selection of the appropriate conductor section. In this study the parameters about the short circuit and the techniques of calculating the faults in system and the necessary theoretical knowledge for the short circuit fault to be understood better have been given. The effect on the distributed generation and the grid which is caused by the possible short circuit faults have been simulated by being modeled in PSS/Sincal and by using the real grid parameters with cogeneration power plant in Izmir Turkey. The real short circuit fault results measured from the power plant and the grid and the results obtained from the software program have been compared and it has been determined that there is not a significant difference between them. Thus it has been emphasized that it is correct to simulate before investing in a power system in for the purpose of restrain the faults during the designing and working before the application. It allows the designer to design new power plant as good as plan expansion of existing power plants with higher degree of precision. Considering the prices of protection equipment which has a large part in system design this way would allow designer to reduce the cost of the protective equipment and remaining stability. © 2023 Elsevier B.V. All rights reserved.
Citation - WoS: 6
Citation - Scopus: 6
A tale of two hashtags: An examination of moral content of pro- and anti-government tweets in Turkey
(John Wiley and Sons Ltd, 2021-04) Fatih Bayrak; Sinan Alper; Alper, Sinan; Bayrak, Fatih
During the campaign period of the 2018 Presidential Election in Turkey there was a burst in the number of tweets posted by both pro- and anti-government Twitter users. Both sides started their own hashtags and reached a total of 2 million tweets in only one day. We analyzed the content of 186554 tweets from two opposing ideological camps to test the predictions of Moral Foundations Theory which suggests that liberals and conservatives endorse different moral foundations. We scored each side's level of emphasis on different moral foundations using the Turkish Moral Foundations Dictionary and compared the two groups. Results revealed that the supporters of the conservative government in Turkey were more likely to endorse care loyalty and authority foundations of morality as compared to those who oppose the conservative government. In addition the general moral emphasis was higher in the tweets of the pro-government group. Being one of the first studies investigating the moral content of political tweets in a non-WEIRD context the current study yields important findings regarding the external validity of the Moral Foundations Theory's predictions in different cultures. © 2021 Elsevier B.V. All rights reserved.
Abelian groups whose nonzero endomorphisms have nonessential kernels
(WORLD SCIENTIFIC PUBL CO PTE LTD, 2017-03) Rafail Alizade; Surajo Ibrahim Isah; Alizade, Rafail; Isah, Surajo Ibrahim
In this paper we describe completely the K-singular subgroup of an abelian group and a K-nonsingular abelian group in terms of the basic subgroups of its p-components and the quotient group by the torsion part. We also prove that a pure subgroup and a quotient group by a pure subgroup of a K- nonsingular abelian group are K-nonsingular and give a condition under which a pure extension of a K-nonsingular abelian group by a K-nonsingular group is K-nonsingular.
Citation - WoS: 16
Citation - Scopus: 18
Adolescents' eveningness chronotype and cyberbullying perpetration: the mediating role of depression-related aggression and anxiety-related aggression
(TAYLOR & FRANCIS LTD, 2018-09-05) Sule Betul Tosuntas; Sabah Balta; Emrah Emirtekin; Kagan Kircaburun; Mark D. Griffiths; Kircaburun, Kagan; Emirtekin, Emrah; Balta, Sabah; Tosuntaş, Şule Betül; Griffiths, Mark D.
Recent empirical evidence has indicated a positive relationship between university students' evening-type chronotype and their cyberbullying perpetration (CBP) scores while controlling for gender and Big Five personality dimensions. The aims of the present study were (i) to replicate the results of the aforementioned study with an adolescent sample and (ii) to examine the mediating role of depression anxiety and aggression on the relationship between chronotype and CBP. In order to investigate these aims 493 high-school students were recruited to complete a survey that included the Reduced Morningness-Eveningness Scale Short Depression Scale State-Trait Anxiety Inventory Short Form Aggression Questionnaire and Cyberbullying Offending Scale. Results indicated that while females had higher depression and anxiety scores males scored higher on CBP. Path analysis showed that aggression depression-related aggression and anxiety-related aggression fully mediated the relationship between evening-type chronotype and CBP. There were also significant gender differences in the model. Furthermore physiological factors had an indirect effect on CBP via psychological risk factors and emotion-related negative behaviors.
African studies in Turkey, Türkiye’de Afrika çalışmaları
(Forsnet bilgi@uidergisi.com.tr, 2016-08-24) Elem Eyrice Tepeciklioğlu
This article aims at providing an analysis of African studies as a recently emerging field of study in Turkish academia. For many years African issues had low priority in both policy and academic circles. The article argues that the recent scholarly interest in African issues is largely a product of the increasing political interest towards the continent. Although the existing literature mostly concentrates on Turkish-African relations and the study of particular African issues remain limited in number African studies in Turkey has made progress and is still evolving with an expanding and diversifying literature. © 2020 Elsevier B.V. All rights reserved.
An alternative MILP model for makespan minimization on assembly lines
(Springer Verlag service@springer.de, 2016-06-27) Sel Ozcan; D. T. Eliiyi; Levent Kandiller
The Simple Assembly Line Balancing Problem-2 (SABLP-2) is defined as partitioning the tasks among stations in order to minimize the cycle time given the number of stations. SALBP-2 reduces to the identical parallel machine scheduling problem with makespan minimization (Pm‖ Cm a x) when precedence relations are ignored providing a lower bound. In a certain layout setting tasks revisiting the same station over consecutive tours might be preferable when the sole objective is to minimize the makespan of producing the order quantity. In this study the tradeoff between the makespans obtained from SALBP-2 and (Pm‖ Cm a x) as a function of order quantity is analyzed. A piecewise linear concave makespan function is observed. We developed an alternative model formulation and an iterative solution scheme for makespan minimization for all possible order quantities. The results of our computational experiment indicate that SALBP-2 outperforms for small order quantities whereas (Pm‖ Cm a x) yields the best results for larger order quantities. However there is a certain range of order quantity for which the proposed model dominates the other two. Our results are validated in benchmark instances. © 2017 Elsevier B.V. All rights reserved.

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